Volume 2: 1771 Edition of the Encyclopedia Britannica!
Canon
Canon, in music, a short composition of two or more parts, in which one leads, and the other follows: Or it is a line of any length, shewing, by its divisions, how musical intervals are distinguished, according to the ratios, or proportions, that the sounds terminating the intervals, bear one to another, when considered according to their degree of being acute or grave.